OnFrameAvailable回調不來了

Question

我是新來的Android應用程序，我想用相機使用SurfaceTexture。 OnFrameAvailable()的回叫沒有被稱爲...請給我一個解決方案。代碼如下。

這裏缺少什麼？我不確定是否對setOnFrameListener()進行了正確的呼叫。

package com.example.cameratest; 
import com.example.test.R; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.View; 


import android.graphics.SurfaceTexture; 
import android.graphics.SurfaceTexture.OnFrameAvailableListener; 
import android.hardware.Camera; 
import android.media.MediaCodec; 
import android.media.MediaCodecInfo; 
import android.media.MediaFormat; 
import android.media.MediaMuxer; 
import android.opengl.*; 

import android.util.Log; 
import android.view.Surface; 


import java.io.IOException; 
import java.nio.ByteBuffer; 
import java.nio.ByteOrder; 
import java.nio.FloatBuffer; 
import java.util.concurrent.locks.ReentrantLock; 

public class MainActivity extends Activity implements OnFrameAvailableListener { 
private static final String TAG = "CameraToMpegTest"; 
private static final boolean VERBOSE = true;   // lots of logging 
// where to put the output file (note: /sdcard requires WRITE_EXTERNAL_STORAGE permission) 
private static final long DURATION_SEC = 8;  
// camera state 
private Camera mCamera; 
private static SurfaceTexture mSurfaceTexture; 
private int[] mGlTextures = null; 
private Object mFrameSyncObject = new Object(); 
private boolean mFrameAvailable = false; 

protected void onCreate (Bundle savedInstanceState){ 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
} 

public void startCamera(View v){ 
try { 

this.initCamera(0); 
this.StartCamera(); 


} catch (Throwable throwable) { 
throwable.printStackTrace(); 
} 
} 

private void StartCamera() { 

try { 

mCamera.startPreview(); 

long startWhen = System.nanoTime(); 
long desiredEnd = startWhen + DURATION_SEC * 1000000000L; 

int frameCount = 0; 

while (System.nanoTime() < desiredEnd) { 
// Feed any pending encoder output into the muxer. 

awaitNewImage(); 
} 
} 
finally { 
// release everything we grabbed 
releaseCamera(); 

} 
} 

/** 
* Stops camera preview, and releases the camera to the system. 
*/ 
private void releaseCamera() { 
if (VERBOSE) Log.d(TAG, "releasing camera"); 
if (mCamera != null) { 
mCamera.stopPreview(); 
mCamera.release(); 
mCamera = null; 
} 
} 

private void initCamera(int cameraId) { 

mCamera = Camera.open(cameraId); 
if (mCamera == null) { 
Log.d(TAG, "No front-facing camera found; opening default"); 
mCamera = Camera.open(); // opens first back-facing camera 
} 
if (mCamera == null) { 
throw new RuntimeException("Unable to open camera"); 
} 

Camera.Parameters parms =mCamera.getParameters(); 
parms.setPreviewSize(640, 480); 
mGlTextures = new int[1]; 
GLES20.glGenTextures(1, mGlTextures, 0); 


GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES,mGlTextures[0]); 


GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, 
GLES20.GL_NEAREST); 
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, 
GLES20.GL_LINEAR); 
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, 
GLES20.GL_CLAMP_TO_EDGE); 
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, 
GLES20.GL_CLAMP_TO_EDGE); 
mSurfaceTexture = new SurfaceTexture(mGlTextures[0]); 
try { 
mCamera.setPreviewTexture(mSurfaceTexture); 
} catch (IOException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} 
mSurfaceTexture.setOnFrameAvailableListener(MainActivity.this); 


} 
public void awaitNewImage() { 
final int TIMEOUT_MS = 4500; 
synchronized (mFrameSyncObject) { 
while (!mFrameAvailable) { 
try { 
// Wait for onFrameAvailable() to signal us. Use a timeout to avoid 
// stalling the test if it doesn't arrive. 
if(VERBOSE) Log.i(TAG, "Waiting for Frame in Thread"); 
mFrameSyncObject.wait(TIMEOUT_MS); 
if (!mFrameAvailable) { 
// TODO: if "spurious wakeup", continue while loop 
throw new RuntimeException("Camera frame wait timed out"); 
} 
} catch (InterruptedException ie) { 
// shouldn't happen 
throw new RuntimeException(ie); 
} 
} 
mFrameAvailable = false; 
} 


} 

@Override 
public void onFrameAvailable(SurfaceTexture st) { 
if (VERBOSE) Log.d(TAG, "new frame available"); 
synchronized (mFrameSyncObject) { 
if (mFrameAvailable) { 
throw new RuntimeException("mFrameAvailable already set, frame could be dropped"); 
} 
mFrameAvailable = true; 
mFrameSyncObject.notifyAll(); 
} 
} 
} 

Answer 1

在我的理解onFrameAvailable應與線程一起使用。隨着我不是面臨的問題，並確保updatetextImage被稱爲接收幀

Answer 2

我認爲你必須調用SurfaceTeture.updateTextImage()您OnFrameAvailable()回調後告訴相機在「我用你的最後一幀，再給我一次一」。

（很抱歉，但我的英語能不能提供一個更好的解釋）

Answer 3

@Override 
    public void onFrameAvailable(SurfaceTexture surfaceTexture) { 
     ... 
     surfaceTexture.updateTexImage(); 
    } 

有同樣的問題，好像我忘了打電話的updateTexImage（）